Feedback Agreement

[Harikishan Desineni]

Dear all,

I am a freelance contributor to dash.js 

Feedback agreement from my company (Blue Lotus software) is attached.

My first PR for review is here https://github.com/Dash-Industry-Forum/dash.js/pull/4113

It attempts to fix the following issue 

"Quality change is not possible once fully buffered #3836"

Thanks,

Hari